I'll second that. I've owned two of these keyboards (one for work, one for home) for 16 years and they are still going strong. Nothing else really worked for me. They've taken me through 3 employers now.

It does take some getting used to, but once you've made the transition, you won't want to go back. You'll type faster, with almost no strain, and more accurately.

I didn't suffer from carpal tunnel but I'd get a lot of tension in my back and shoulders leading to sharp pains and deep aches that would last for days. Started using an Advantage2 and trackball in my non-dominant hand at work and within a week the symptoms were gone (and have stayed gone for a few years). I still use a normal keyboard and mouse in my dominant hand at home but the time spent that way is much less.

Same. I would not be able to do the last 8 years of my life if it weren't for these keyboards.